US3807441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically operated valves for delivering fluid under pressure
Assignee: Automobiles Citroen SA
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Filing: 1972-06-06
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Granted: 1974-04-30
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Expires: 1992-06-06
Abstract
Abstract An electrically operated valve comprises a distributor having a slide operative to selectively place a fluid actuated device in communication with a source of pressurised fluid, or with a fluid outlet. The slide is actuated by an electrodynamic motor in response to a control signal, whereby the fluid pressure in the device is dependent on the signal.
Inventors
- 👤 A Grosseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:15
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0603; F16K31/061; F16K31/0613; F16K31/08; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409; Y10T137/7722; Y10T137/7781; Y10T137/7782; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
In an electrically operated valve for delivering a fluid pressure governed by a control signal, a. feed pipe means, b. means defining an outlet, c. a fluid pressure source, d. a distributor connected to said fluid pressure source and said feed pipe and outlet means, e. said distributor having slide means selectively placing the feed pipe means in communication with said source of fluid under pressure and with the outlet, f. a fluid actuated device associated with said distributor, g. means subjecting the slide means to a first axial force dependent on pressure within said associated fluid-actuated device, and h. an electrodynamic motor, having a winding through which flows a current governed by the control signal, the said winding constituting the moving part of the electrodynamic motor and being connected to the slide means to apply a second axial force thereto.
Claim 2
Dependent Claim
141 words
In an electrically operated valve for delivering a fluid pressure governed by a control signal, a. feed pipe means, b. means defining an outlet, c. a fluid pressure source, d. a distributor connected to said fluid pressure source and said feed pipe and outlet means, e. said distributor having slide means selectively placing the feed pipe means in communication with said source of fluid under pressure and with the outlet, f. a fluid actuated device associated with said distributor, g. means subjecting the slide means to a first axial force dependent on pressure within said associated fluid-actuated device, and h. an electrodynamic motor, having a winding through which flows a current governed by the control signal, the said winding constituting the moving part of the electrodynamic motor and being connected to the slide means to apply a second axial force thereto.
Claim 3
Dependent Claim
16 words
A valve as claimed in claim 1, in which the electrodynamic motor includes a permanent magnet.
Claim 4
Dependent Claim
25 words
A valve as claimed in claim 1, in which the electrodynamic motor comprises one fixed winding for creating a magnetic field, and one moving winding.
Claim 5
Dependent Claim
40 words
A valve as claimed in claim 1, in which the force acting on the winding and the force dependent on the pressure in said associated device act in opposite directions so as to cancel each other out at least partially.
Claim 6
Dependent Claim
29 words
A valve as claimed in claim 4, further comprising linking means connecting the winding to the slide means, said linking means applying a mechanical advantage to the slide means.
Claim 7
Dependent Claim
50 words
A valve as claimed in claim 1, in which the force acting on the winding and the force dependent on the pressure in said associated device act in the same direction, said valve further comprising means exerting a force on the slide means opposite in direction to the other forces.
Claim 8
Dependent Claim
18 words
A valve as claimed in claim 6, in which the means exerting the opposite force comprises a spring.
Claim 9
Dependent Claim
83 words
A valve as claimed in claim 7, in which the spring is pre-stressed and exerts sufficient force on the slide means to retain the slide means in a position in which the feed pipe means is in communication with the source of fluid under pressure, even when the pressure in the associated device is at a maximum, the said force being insufficient to hold the slide means in the said position once the force acting on the winding has reached a predetermined value.
Claim 10
Dependent Claim
81 words
A valve as claimed in claim 1, in which the said means subjecting the slide means to a force dependent on the pressure in the associated device comprises means defining a chamber in communication with the feed pipe means, and a movable thrust member, the thrust member being smaller in section that the slide means, one end portion of the thrust member being received in said chamber, and the other end of the thrust member being movable with the slide means.
Claim 11
Dependent Claim
22 words
A valve as claimed in claim 9, in which the said other end of the thrust member bears against the slide means.
References Cited (Backward Citations)
US3179123A
Cited
US3401711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |